fixed link in Android plugin code that referenced old behaviour a fix…

… was for (#2217)

flutter_local_notifications/android/src/main/java/com/dexterous/flutterlocalnotifications/FlutterLocalNotificationsPlugin.java

@@ -705,7 +705,7 @@ private static void setupAlarm(
       // This is to account for notifications created in older versions prior to allowWhileIdle
       // being added to the deserialiser.
       // Reference to old behaviour:
-      // https://github.com/MaikuB/flutter_local_notifications/blob/master/flutter_local_notifications/android/src/main/java/com/dexterous/flutterlocalnotifications/FlutterLocalNotificationsPlugin.java#L735
+      // https://github.com/MaikuB/flutter_local_notifications/blob/4b723e750d1371206520b10a122a444c4bba7475/flutter_local_notifications/android/src/main/java/com/dexterous/flutterlocalnotifications/FlutterLocalNotificationsPlugin.java#L515
       notificationDetails.scheduleMode = ScheduleMode.exact;
     }